Depends which DA you get and how long before you plan to plant it, IMO.

I've had roses like Tamora and Propero in 1/2 whiskey barrels grow to maturity but Golden Celebration and Christopher Marlowe would need to be transplanted by their second year in order to grow to a natural size.

Some roses I start in the same 5-gallon pots the nurseries use. These I either intend to plant within the year or put into a rose raffle if I decide not to keep it (this actually happens sometimes, lol). If I'm potting up a worker rose (one that gets hauled around to pruning demos), then it goes into a 20-gallon nursery pot where it will probably stay for at least 1-2 years.

My climate is low desert with a year-round growing season so roots are much better protected in the ground than a container when it's 110F outside, especially black nursery pots.